First time SignIn pop-up with Firebase SwiftUI - ios

Question

I'm trying to make a feature to show a pop-up when a user logs in for the first time with Firebase, except that when I print it doesn't work. When printing it returns false in all cases
Good to know, the accounts are created from the console!
AuthView.swift
func on_connect() {
if self.email != "" && self.pass != "" {
Auth.auth().signIn(withEmail: self.email, password: self.pass) { (res, err) in
if err != nil {
self.error = err!.localizedDescription
self.alert.toggle()
return
}
if res?.additionalUserInfo?.isNewUser == true{
print("IM NEW!")
UserDefaults.standard.set(true, forKey: "status")
NotificationCenter.default.post(name: NSNotification.Name("status"), object: nil)
}
else{
UserDefaults.standard.set(true, forKey: "status")
NotificationCenter.default.post(name: NSNotification.Name("status"), object: nil)
}
}
}
}
Thanks for your precious help!

Answer 1

Issue #1:
You have two delivViewModels:
#ObservedObject private var viewModel = delivViewModel()
#ObservedObject var first_log: delivViewModel
The first one is getting created inside LoggedView and the second looks like it's getting passed in via a parameter. It's hard to imagine a scenario where you'd need both, so get rid of one of them so that you don't end up calling functions on both, which happens later on:
self.viewModel.is_first_loggin() // called on viewModel
print("first sign in-> \($first_log.first_log)") // called on first_log
Issue #2:
Auth.auth().signIn, like nearly every network function, is asynchronous. This means that it doesn't return immediately (it'll return at an indeterminate point in the future), so code run directly after it will complete before signIn itself has completed. However, the code in the callback function/closure (what you see in the {} after signIn) will get called after its completion.
In terms of printing the value, I'd just move that code inside of the callback function. You'd have:
Auth.auth().signIn(with: credential) { (result, error) in
if error == nil {
if result?.additionalUserInfo!.isNewUser == true {
self.first_log = true
} else {
self.first_log = false
}
print("First log in? \(self.first_log)")
}
}
In terms of showing the popup that you mentioned, you can show that conditionally based on $viewModel.first_log (this is assuming that you've chosen viewModel to be the delivViewModel you want to keep.
Something like:
.sheet(isPresented: $viewModel.first_log) {
Text("Popup stuff")
}
If you did want a way to respond to first_log in your view once it is asynchronously set, you could also look into onReceive (How can I get data from ObservedObject with onReceive in SwiftUI?), however there may not be a use case for it here (unless you're going to drop back into UIKit to display the popup imperatively or something).